If you want a tough bag for colostrum storage which won't leak and thaws quickly have a look at our new Store & Thaw screw top bag. Its a 5 litre bag but we suggest you only put 2 litres in it to get a nice thin layer of ice and easy to thaw. For a complete thawing system,at a reasonable price, look at our Store & Thaw tank complete with submersible baskets to hold bags underwater.It has a heater/circulator as well as an accurate thermostat so you can set it at 50 degrees C and be sure you wont cook the antibodies! www.pyonproducts.com/store-and-thaw/